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Purpose. To analyze changes in binocular vision functions in patients with acutely acquired esotropia after preoperative correction by prisms. Material and methods. The study included 16 patients with acutely acquired esotropia with diplopia. Depending on the tactics of preoperative case management, two groups were distinguished. Eight patients with acutely acquired esotropia of the Bielshowsky type at the age from 12 to 35 years old (mean age, M±sd – 17.5±1.9 years). This group underwent preoperative prismatic correction of diplopia and the deviation angle, as well as eight patients with acutely acquired esotropia of the Bielshowsky type at the age from 12 to 35 years (18.5±1.9 years). Patients in this group underwent surgery without prior prismatic correction. Fresnel prisms were used to select and assign prismatic correction. The patien s were monitored dynamically. Results. In the course of treatment 1 group (prismatic correction followed by surgical correction) according to the indicator of Worth’s four-dot test color test, revealed a statistically significant increase in the frequency of value of the binocular single vision (p=0.041), the frequency of the presence of stereovision according to the Fly-test (p=0.013), fusion amplitude in the distance by 1.11 times (p=0.033) and near fusion amplitude by 1.15 times (p=0.003). Significant differences between the groups were observed only in the frequency of stereovision presence according to the Fly-test after treatment, which was 2.0 times higher in group 1 (p=0.041). Conclusion. Prismatic correction in combination with surgical treatment had better curative benefits than surgery itself in improving both binocular and stereoscopic visual functions.

Purpose. Analysis the effectiveness of prismatic correction in the treatment of congenital horizontal nystagmus. Material and methods. The study included 20 patients with congenital horizontal nystagmus. Depending on the type of nystagmus and compensatory mechanisms to reduce its amplitude, two groups were identified: 10 patients with pendular nystagmus and nystagmus blockage syndrome (mean age, M±sd, 5.8±1.9 years) and 10 patients with jerky nystagmus and abnormal head posture and a null zone (5.7±2.1 years). Fresnel prisms were used to select and prescribe prismatic correction. Patients were under dynamic control from 6 months to 2 years with an assessment of the results every 3 months. Results. During treatment (using prism correction), uncorrected visual acuity had a statistically significant increase of 1.8 and 1.5 times both in the first (p=0.004) and the second (p=0.001) group, respectively. A similar, and even more pronounced, change in visual acuity was observed for corrected visual acuity – in the first group it increased 3 times (p=0.001) and in the second group 2.2 times (p=0.001). Conclusion. Prismatic correction in pendular nystagmus and esotropia allows to simulate (eliminate) nystagmus blockage syndrome and, thereby, to improve the quality of vision of the patient. In its turn, prismatic correction in jerky nystagmus with abnormal head posture allows to move null zone into the primary position of gaze, increase visual acuity due to the optimal optical correction and improve the patient’s quality of life.